Hal deBolt's Classic CL Stunters

Fran Ptaskiewicz photographed 1946 Ripe Originally powered Ohisson & Rice 23 Fran says needed added power DeLong 30 fly well Fran early employee Hal deBolts kit company has good memories early days both working Hal competing him Control Line meets CONTROL LINE modelers have tak ing Old-Timer Stunt flying OTS short greater numbers recent years OTS event rules call aircraft de signs dating prior December 31 1952 aerobatic pattern flown outlined 195 1-52 AMA rule book popularity nostalgia vintage events cuts across modeling categories Control Line OTS paralleled SAM Society Antique Modelers Old-Timer events Free Flight Radio Control terest early RC models prompted re cent formation Vintage Radio ConHal deBolts trol Society Probably thing draws modelers Old-Timer events lower level competitive pressure con tests tend fun oriented em phasis social gatherings camaraderie rather win-at-all-costs competition Models SAM Old-Timer Free Flight Radio Control events must de signs originally built no later De cember 1942 cutoff date An tique SAM designs December 1938 Vintage RC Society looking three cate gories Early Antique designs originat ing prior December 31 1950 Early Bird models dating 1951 through December 1955 Vintage designs Classic CL Stunters look innovator Hal deBolts tremendous impact early days Control Line flying great contribution designs have made sport U Dick Sarpolus Two nice shots Super Ripe ship built Jim Lee powered K&B 40 Super Bipe introduced 1948 third series acrobatic deBolts biplane designs fully symmetrical airfoils shorter tail moment larger elevators original Ripe Super Ripe evolved excellent popular CL trainer As CL Aerobatics progressed monoplanes came own superior performers Bipes fell out favor course Hal early became pacesetter monoplane design well 66 Model Aviation famous Ripe design got Hal deRolt business 1948 photo taken Fran Ptas kiewicz shows Hals original Ripe particular model powered Drone Diesel originating between January 1956 De cember 1965 Control Line Old-Timer Stunt de signs must December 31 1952 ear lier vintage Currently under discussion CL Nostalgia category would lim ited 25-year-old designs idea continually open door different aircraft designs Old-Timer events attract participants ages Often models go back farther modelers repli cating models introduced before bornand having great time fly ing Other modelers indeed going back time re-creating designs flew years ago Today course can better materialsstronger glues better coverings paints smoother powerful engines cases latter-day ver sions classic designs fly perform better prototypes truly want go back old days can still build silkspan dope complete authenticity can add reproduction ignition engine Whether Control Line Free Flight RC finding plans vintage models isnt much problem wide spread interest older designs plan repro ductions available quite few sources Everyone involved nostalgia flight has own favorites among old designs whove sport long enough probably favor aircraft flew back Fifties Sixties OTS circles designer mentioned Hal deBolt As long time competitor designer kit manufac turer Hal deservedly AMA Hall Fame Though probably best known today achievements RC has also active Control Line Free Flight over years keep winning techniques secret Hal has consistently reached out other modelers assistHals 1948-designed Stuntwagon recently built author left see its bare bones right finished model Hals con struction techniques set pace futuresheeted leading trailing edges top bottom spars reinforcing spar diagonals rib cap stripsall 1948 Stuntwagon first designs capable todays CL Stunt routines both structurally aerodynamically May 1990 67 Two very nice views classy Bipe built Ron Kirchner Encino CA Ron presently flies gem Control Line exhibitions shows Its powered Testor/McCoy 29 engine Doug Dahike photographed back 1979 Old-Timer Stunt competition holding deBolt-designed Stuntwagon 30 Hal de signed kitted smaller version Stuntwagon popular 29 engines John Miske photographed 1950 Stuntwagon 30 powered Dooling 29 ance encouragement Hal pivotal growth Con trol Line modeling branch story CL aircraft designs encapsulates history CL competition development Hal always th leading edge tech nology early days CL compe tition aircraft performance helped set format competitive events favored Speed Racing events both CL RC competition commenting Aerobatics competition demands prac 0 hes ever time cer tainly didnt stop Hal however coming top Aerobatics competitor excellent aircraft hes developed Hal deBolt began flying Control Line earnest serving Patuxent River Naval Air Station Maryland during 1940s An airplane modeling group known Navy Patuxent River Model Engi neers organized recreational activity understand club still ac / tive today Control Line newest form model aircraft flying time design efforts aimed stable per formance engineering plane stay out end control lines Lead-out rake outboard wing tip weight engine thrust offset rudder trim other under pinnings successful CL flight still being worked out Jim Walker traveling country popularizing CL flight demonstrations Fireball flew counterclock \ I 0 Bipe deBolts first kit introduced 1945 Though CL flying new relatively unknown activity design workedit stable easy fun fly stayed out end lines good trainer needed 50000 kits produced sold model long tail moment Its wing span 22 200 sq area flat bottom airfoils cI Super Bipe came out 1948 third Bipe series final development deBolts biplane designs larger symmetrical airfoils model shorter tail moment larger elevators side-mounted engine 28-in span 200 sq wing area aerobatic earlier ones 68 Model Aviation Left An lnfantwagon powered Fox 049 engine built Fred Bridgeman 0 santa Ana CA K&B came out its Tirst hA en gine Infant Hal soon responded lnfantwagon earliest small Stunters quickly accepted modelers thou sands kits sold Right Another Stuntwagon 30 built photographed 1950s Ward VanDuzer remembers fondly wise direction way almost CL flying done today Hal deBolt took different approach him seemed logical fly clockwise let engine torque effect sist keeping aircraft tight lines 0 Though could built flying either direction Hals CL designs set up clockwise flying other fliers followed lead Hals analytical approach design evident Bipe successful flier ideal CL trainer time greatly needed Bipes long tail mo C ment small elevators contributed its stability Hal used two wings get area compact layout working out ex treme stagger arrangement close-togeth er placement top bottom fu selage no loss efficiency made construction easy strong An interesting design feature twoII untwagon debuted 1948 Hals full-house all-out Stunt machine Fast exciting designed 60-size en gines 70-ft lines featured 58-in wingspan 667 sq wing area large fully symmetrical thick airfoil short tail moment novel time Construction methods de veloped give Stuntwagon its strength still relevant today American Sr came out 1951 51-in wingspan 510 sq wing area designed powered 29 35size engines Its still popular designs Old-Timer Stunt competition today lightly constructed featured larger inboard wing panel deBolts asymmetrical stability idea Hal intended American series designs primarily aero batic trainers Stuntwagon top competition model May 1990 69 Left The Sportwing unique design Hal developed early 50s sport flying true flying wing elevators built wing trailing edge too sensitive all-out Stunt flying made fabulous sport flier example built Barry Baxter Cypress CA still flies today Old-Timer fun Right Ward VanDuzer center poses deBolt Sportwing two Con trol Line flying buddies back 1950s front Richs Hobbytowne well-known New Jersey center CL aeromodeling time Mtesting popularity deBolt designs newly built American Senior recently photographed Old-Timer Stunt meet Right Another new American Sr gorgeous ship built current top competitive flier Kaz Minato wasnt born Hal designed airplane high-tech new-wave graphics finish brings 1951 classic design right up 1980s looks great degree negative incidence setting rear wing allowed top wing stall first slow speeds early days CL remember flying done upright addition compared what have today available engine power wasnt substan tial first Bipe powered Brown Jr Tiger Aero other en gines used later editions Bipes built Patuxent NAS its quick acceptance told Hal modelers con sidered innovative model good way get Control Line flying As Hal approached end military service modeling buddies Navy draftsman offered plan drafting Bipe Hal would produce aircraft commercially point deflolt decided make model aircraft de signing kit manufacturing full-time business Out Navy back home Buffalo NY founded Dmeco deBolt Model Engineering Company using savings $2000 Initially one-man op eration Dmeco began producing adver tising Bipe kits 1945 orders poured Hals father others stepping help Dmeco produced Ripe kits next two years Eventually 50000 kits shipped second plane series called New Bipe deBolt increased wing area added symmetrical airfoils Fi nally 1948 came Super Bipe creased wing area thicker symmetrical air foils side-mounted engine large ele vators Super Ripe aerobatic its predecessors Around time however competitive Aerobatics flying taking hold modelers losing interest biplanes promised less successful competition monoplanes Hal turned design efforts con ventional monowing aircraft Aside Bipes later monowing Aerobatic aircraft Hal directed much Control Line work toward Speed events thats competitive ac Continued page 182 Left deBolts Super Wildcat ship first design inverted flight Unique time Hal used fully symmetrical wing New techniques design flying learned Fran Ptaskiewicz Tonawanda NY took old photo model powered ignition Mccoy 49 engine Right Continental deBolts last Control Line design effort Stunter based Goodyear racers 1950s model recently built Paul Rundell Topeka KS keeping designs vintage found old K&B Glo-Torp 29 power 70 Model Aviation Clifton NJ posing Fox 35-powered American Sr 1952 John has active years pro moting Old-Timer Stunt competition As photo attests has involved CL Stunt flying almost since very beginning An old 1950s photo Ward VanDuzers Sparta NJ deBolt-designed American Jr sans engine Ward hand painted flame trim leading edge wing SAVE YOUR FIELD SNUF-LER muffler isa low cost easy install lightweight Sound reducing muffler no performance penalty answer AMA muffler rule suggestions saving flying fields Meets AMA muffler rule suggestions 3 10 decibels quieter stock muffler No power loss possible 300-500 RPM incresse Improves engine idle s better fuel economy Easily attached 25-108 stock mufflers Heat corrosion resistant Black E coat finish No special adapters required Weighs 35 ozs Fits ASP BRAT ENYA FOX HP IRVINE K & B OS MAX ROYAL YS SUPER TIGRE mufflers available hobby shop ORDER DIRECT immediate shipment Check MO Visa MC COD SEND 250 STAMP accepted Add $2SOfor UPS $2Otfor COD t% salestax FOR ADDITIONAL INFO h Calif resident AND JTEC CATALOG CL Combat/Johnson Continued page 178 youre willing take weight penalty using ABC piston/liner set rather AAC about other concessions af ter market need make better head button full-complement bearing connect ing rod RPMalthough stockers have proven work pretty well have enough clearance have chance making Blad der Grabber should time youll probably witness contest well talking about decades Americans vs Russians about British Could handle 36powered model deBolts Classic/Sarpolus Continued page 70 tivity focused well Dmeco line cluded variety Dmeco Specials Speedwagons different sizes successive ver sions incorporating latest Speed design ideas Dmeco advertising frequently listed wins deBolts models Speed competi tions along lots ballyhoo like Dmeco sensation 46 Speedwagons take over 48 nations fastest mod els Home Design-Engineered Models companys motto Inverted flight big breakthrough CL flying Though may hard imagine today pioneers era designing controlling aircraft fly inverted quite challenge Fliers attempting over country Hal heard done California too began work design verted flight capability keep kit company going Hals design ef forts usually intended commercial pro duction decided Scale kit lat est venture Navy background Grumman Wildcat made logical choice proto type full symmetrical airfoil course necessity Hal aligned elevator wing thrust line Wildcat fully builtup sheeted fuselage good scale appearance During its first attempt inverted flight Wildcat crashed its second lap Inverted flight techniques learned practicing aircraft took much work build seemed wrong Hal So get air faster intending strictly interim measure fashioned solid wood slab-type fuselage became known profile construction technique Hal may have first try Con trol Line modeling Several notable CL industry people saw Dmeco experimental inverted flight Wildcat before long other profile CL aircraft kits ap peared market Hal unwittingly started trend since profiles found estab lished place design construction technique Dmeco continued produce Wildcat kit 1948 though Hal gone fullhouse no-holds-barred Aerobatic design called Stuntwagon became famous Hal deBolts aircraft events early days Aerobatics wasnt flown precise controlled pattern maneu vers sees today originated fast fu rius event flown large engines high speeds long lines contests included Continued page 184 182 Model Aviation SN U F-FLEWTM MUFFLER Patented $2495 CAT NO BOO free-style pattern segment pilot flew own menu maneuvers Such maneu vers ioop wingovera wingover eight loops along waywere common along point-down triangles three-leaf clovers flip-flop eights showmanship flying kneeling fly ing either hand etc As typical deBolts designs Stuntwag aerodynamically clean Hal thought 60-size engine larger aircraft swer windy weather flying capahility gave Wagon generous 667-sq-in wing area Though increased thickness symmetrical airfoil still fast airplane prototype model lost wing folded during flightan instructive accident led Hal build thicker wing increased strength maneuvering ability Stuotwag drop-off landing gear less drag higher speeds OTS competitors today may note later Stuntwagons utilized fixed sheet aluminum landing gear similar deBolts American designs Using very short tail moment arm mak ing elevator area large produced required maneuverability balance Stuntwagons nose length varied suit weight en gine used tapered wing planform straight leading edge swept-forward trail ing edge time deBolt worked out con struction techniques wing strength light ness anticipated contemporary standard upper lower main spars sheeted leading trailing edges rib cap strips diagonal brac ing between spars Hal powered Stuntwag ons engines such Atwood lighter Hornets McCoys some fliers used flew 70-ft lines wanted plane fast course rivalry among big names Aerobatics Hal recalls certain meet Orwick engine people claimed Yates Madman powered firms new en gine fastest Stunter around Hal disputed stopwatches backed him up Stuntwagon turning 105 mph versus Madmans 85 mph After news came West Coast about Palmers use wing flaps Hal tried Stuntwagon Probably due very short tail moment model used wing flaps brought no added benefit Hal went design kit Stuntwagon 30 smaller version popular 29 engines K&B brought out first engine Infant Hal responded Infantwagon earliest small Stunters good move since Omeco sold thousands lnfantwagon kits last phase Stuntwagon development lighter version built 35 en gine power Hal says flew well shorter 60ft lines never kitted Following Stuntwagons Hal went de sign American series American Senior best known series quite popular OTS competition today its large wing area thick airfoil 35 power make easy-tohandle capable flier Hal considered Stuntwagon ultimate Aerobatics competition American aircraft conceived introduction Aerobatics series comprised four sizes various engine ratings small est profile fuselage no landing gear larger versions used full built-up fu selage conventional sheet aluminum landing gear Hal remembers own American Sen ior flew better him Fox 29 thought added power Fox 35 made difficult maneuver well l9-powered American Junior proved nicest-flying air craft seriesone designs real joy fly seem fly themselves controversial design feature Americans longer inboard wing pan el Hal used provide asymmetrical stability Moving fuselage outboard wing orized would counterbalance weight drag control lines result lighter efficient aircraft dispute the ory today use variable lead-out rake adjustable tip weight etc trim Americans As Hals other CL designs Americans set up clockwise flying Most however probably built generally ac cepted counterclockwise flying unique aircraft Dmeco line th Sportwing before inception th Combat event Sportwing true fly ing wing designed its name implies spot flying An abbreviated fuselage held engine landing gear vertical fin wing ta pered swept forward elevator hinged rear Sportwing remem being sensitive exciting fun Though certainly aerobatic model lively true Stunt competition Another Hals uncommon Aerobati aircraft twin-engine-powered Stunter fe two 049s A/I Twin Styled after Grutr man Skyrocket exciting easy-buildin design final deBolt CL Aerobatic design th Continental medium-sized airplane powere engines 29-35 range As usual very clean airplane resembling Goodyear P Ion Racers period Its now seen occasiot ally around OTS circles 184 Model Aviation Dmeco kits regarded top quality wood included materials best application parts well machined accurate plans clear easy follow Being active flier competitor himself Hal would conduct extensive personal testing before incorporating idea kits using what found work well Hal structed employees work kit going buy themselves No bad wood used would also tell custom ers kits better because made skilled model builders design en gineering strived light weight strength simplicity construction minimum parts Though todays sophisticated kits have extensive prefabrication include specialized hardware day Hals kits among best As far know deBolt CL Aero batic designs published magazine con struction article Hal did design work exclu sively Dmeco kits Fortunately OldTimer CL fans plans Aerobatic designs available today years ago Hal arranged copyright release CL de signs Fran Ptaszkiewicz early Dmeco em ployee authorized Fran sell plan copies deBolt designs listing avail able plans contact Fran 23 Marlee Drive Ton awanda NY 14150 Asked pick favorite CL Aerobatic design Hal chose Ripe since aircraft started everything off sheer aerobatic per formance though big Stuntwagon claims loyalty speed excitement 100-mph maneuvering 70-ft lines noise feel airplane combine make fav orite Stuntwagon among models Hal takes pride hes bit sur prised American Senior seems better known popular OTS activity day Fran Ptaszkiewicz presents some interesting formation about early CL days worked Dmeco enjoyed flying de Bolt Most Hals employees modelers encouraged Hal compete no model building done during working hours Dmeco boss Hal went con tests took along local youngsters possible offering opportunity com pete Hal provided free travel times boys would camp overnight tents con test sites Hal took modelers Buffalo meets Cleveland Mirror meets New York Nationals Olathe Dallas Fran remem bers great years great times Hal Seeing racks models Hals station wag few complained professionalism com petition course group excursions anything factory teams some times taken simply Hals method getting kids models meets Fran recalls Hal arrived certain meet told professional team welcome compete Hal quickly responded agreeing enter requested boys should permitted fly Later day Hal asked serve Stunt event judge did offered constructive criticism flier became interested Old-Timer Stunt flying usual sentimental reasons several years ago Looking around OTS design build recalled having owned Stuntwagon 30 back Continued page 187 0 TOWER HOBBIEU has Mighty Lit worlds first premium grade lIght ptywood Bonds easily CA time right. use Mighty LIte TOWERSrOwERS Special StockSuggestedSPECIAL NumberRetailPRICE HEO 100 1/8x6x121560/6pcs 1299lEpcs HEOllO 1/8x12x244950/6pcs 349916pcs HEO12O 1 /8xl 2x48 4650/3pcs 329g/3pcs Call toll free 1-800-637-6050 Refer ad 01066 May1990 185 Ditectftom PATTERN TEE 320-ET uie Cteek Ct San Jo Ca 95125 Te14Ci298-Q3II Ft4Q829i-53S 1950s also Dmeco Sportwing moat Americans Building large Stuntwagon appealed time around dered set plans Fran Ptaszkiewicz began construction powered updated Stuntwagon Su perTigre 46 incorporated wing tip weight compartment adjustable lead-out guide trimming As OTS rules prohibit drop-off landing gear t added sheet aluminum gear Wagon presumably deBolt used later versions Modern glues hardware made better job could have managed back also used muffler pretty much unknown former days airplane finished off butyrate dope Im enjoying refly ing good old days working Stuntwagon thinking about vintage days Control Line Stunt par ticularly deBolt aircraft carried corres pondence Hal now living Florida re lated some history Dmeco Control Line projects Fran Ptaszkiewicz added information few nice letters Putting article together interesting fun help Mike Keville PAMPA newsletter editor OTS enthusiast able round up photos deBolt CL aircraft modelers across country After Hal Dmeco him shifted Control Line Radio Control activity came equally renowned top designer competitor arena Though better remem bered today achievements RC Hal will never lose standing influen tial designers competitors halcyon days Control Line modeling classic CL designs will flying long time come FlyWorm/de Vries Continued page 75 along inner tube walls ejected opening rear end outer spiral propulsion fins keep airstream whirling around outer tube surface sist propelling craft superpropul sion combination spiraling air cur rents both outside tubular wing angle tube placed line flight sustain craft atr COST elimination parts smaller size combination propul sion lift power principles unit structurally adapting itself mass pro duction should bring sales price aircraft within reach great majority people question mod ern factory equipment quantity produc tion price should compare cheapest automobile today Wouldnt have wonderful actually worked author wishes thank Jack Bol Denver CO sharing discovery FlyWorm certainly invention worth uncovering FF Duration/Linstrum Continued page 77 three grams perhaps fuselage must gram sturdier sustain torque whole drive system mere four grams Compare Telco full tank 15 grams MRC Electric 30 grams obvious model lifting heavy power source will climb less thus have less duration heavier motor less efficient ob taining time aloft will get weight effi ciency system dividing total thrust im pulse weight drive unit comes surprise rubber small models still king twice efficiency electricand mercymy favored CO2 drive limps behind last place beauty rubber motors lies fact torque weight duration can modified will suit individual application feel model should climb faster add few strands dont want increase weight shorten loops Infinite possiblilites exist within wide limits Efficiency 87% Electric efficiency 40% goes up Sanyo cells lighter regular Ni Cds Models limited size make mo tor CO2 efficiency 30% Telco compar atively smallthe thrust developed hardly enough keep 25-gram model level flight thrust up notch model will climb dead air flights including glide about minute picture changes rapidly larger CO2 motors brown MJ-70 displaces 70cc will keep 52-gram model aloft three minutes dead air Brown t40 twin two tanks beats rubber performance largest mo tor will run 6-in prop specified AMA rules Czech Modela Cox 020 CO2 Da vis conversion require much larger props can used AMA competition have slightly edited Fritzs remarks HANGAR-7 RIG & 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Length 351/2 Weightt $39 13 $25 C $9 C/LI DROPIADER 4G nugnip Proflie Fuselage i guiltI Spant 55i/i Areat 540 Sq In. Enginet 40 $24 13 $15 C $7 39 13 S25 C 9 aprenaive Sight Profile Fuselage & RuiltIp Sheeted Wing Wing Spant 52 Areat 435 Sq Sn Enginet 35 Stunt ai~Y C/LI5 Lov Prof ile Fuselage & Soiid Raisa 05055 osog 293/5 Area 305 Sq Engine iS Cu C/LI tilfIE 5255 iS $ 2 2 Sport Piper/Tramoeoi guiltUp Sheeted Wings & Fuseloge Wiog Spant $ reat 200 Sq $7 Dealer Inquiries Invited ORDER YOURS TODAY Please add $4 shipping & handling Send check ar tooney order VISA & MC accepted Ojur street address kits pisese credit cards W STANGEL ENTERPRISES PO BOX 336 Pit t4i4 5484172 WAUKESHA WISCONSiN S31g70338 MEMBER EAA AMA May1990 187 Ideal 4-ycle F3A & AMA fl1ng Basic Ki Pre-tab -Beetle TMSuperStar 6 Basic -built Kit 1S2951 NEW Narukes Silent st 2 4-cycle

Fran Ptaskiewicz photographed 1946 Ripe Originally powered Ohisson & Rice 23 Fran says needed added power DeLong 30 fly well Fran early employee Hal deBolts kit company has good memories early days both working Hal competing him Control Line meets CONTROL LINE modelers have tak ing Old-Timer Stunt flying OTS short greater numbers recent years OTS event rules call aircraft de signs dating prior December 31 1952 aerobatic pattern flown outlined 195 1-52 AMA rule book popularity nostalgia vintage events cuts across modeling categories Control Line OTS paralleled SAM Society Antique Modelers Old-Timer events Free Flight Radio Control terest early RC models prompted re cent formation Vintage Radio ConHal deBolts trol Society Probably thing draws modelers Old-Timer events lower level competitive pressure con tests tend fun oriented em phasis social gatherings camaraderie rather win-at-all-costs competition Models SAM Old-Timer Free Flight Radio Control events must de signs originally built no later De cember 1942 cutoff date An tique SAM designs December 1938 Vintage RC Society looking three cate gories Early Antique designs originat ing prior December 31 1950 Early Bird models dating 1951 through December 1955 Vintage designs Classic CL Stunters look innovator Hal deBolts tremendous impact early days Control Line flying great contribution designs have made sport U Dick Sarpolus Two nice shots Super Ripe ship built Jim Lee powered K&B 40 Super Bipe introduced 1948 third series acrobatic deBolts biplane designs fully symmetrical airfoils shorter tail moment larger elevators original Ripe Super Ripe evolved excellent popular CL trainer As CL Aerobatics progressed monoplanes came own superior performers Bipes fell out favor course Hal early became pacesetter monoplane design well 66 Model Aviation famous Ripe design got Hal deRolt business 1948 photo taken Fran Ptas kiewicz shows Hals original Ripe particular model powered Drone Diesel originating between January 1956 De cember 1965 Control Line Old-Timer Stunt de signs must December 31 1952 ear lier vintage Currently under discussion CL Nostalgia category would lim ited 25-year-old designs idea continually open door different aircraft designs Old-Timer events attract participants ages Often models go back farther modelers repli cating models introduced before bornand having great time fly ing Other modelers indeed going back time re-creating designs flew years ago Today course can better materialsstronger glues better coverings paints smoother powerful engines cases latter-day ver sions classic designs fly perform better prototypes truly want go back old days can still build silkspan dope complete authenticity can add reproduction ignition engine Whether Control Line Free Flight RC finding plans vintage models isnt much problem wide spread interest older designs plan repro ductions available quite few sources Everyone involved nostalgia flight has own favorites among old designs whove sport long enough probably favor aircraft flew back Fifties Sixties OTS circles designer mentioned Hal deBolt As long time competitor designer kit manufac turer Hal deservedly AMA Hall Fame Though probably best known today achievements RC has also active Control Line Free Flight over years keep winning techniques secret Hal has consistently reached out other modelers assistHals 1948-designed Stuntwagon recently built author left see its bare bones right finished model Hals con struction techniques set pace futuresheeted leading trailing edges top bottom spars reinforcing spar diagonals rib cap stripsall 1948 Stuntwagon first designs capable todays CL Stunt routines both structurally aerodynamically May 1990 67 Two very nice views classy Bipe built Ron Kirchner Encino CA Ron presently flies gem Control Line exhibitions shows Its powered Testor/McCoy 29 engine Doug Dahike photographed back 1979 Old-Timer Stunt competition holding deBolt-designed Stuntwagon 30 Hal de signed kitted smaller version Stuntwagon popular 29 engines John Miske photographed 1950 Stuntwagon 30 powered Dooling 29 ance encouragement Hal pivotal growth Con trol Line modeling branch story CL aircraft designs encapsulates history CL competition development Hal always th leading edge tech nology early days CL compe tition aircraft performance helped set format competitive events favored Speed Racing events both CL RC competition commenting Aerobatics competition demands prac 0 hes ever time cer tainly didnt stop Hal however coming top Aerobatics competitor excellent aircraft hes developed Hal deBolt began flying Control Line earnest serving Patuxent River Naval Air Station Maryland during 1940s An airplane modeling group known Navy Patuxent River Model Engi neers organized recreational activity understand club still ac / tive today Control Line newest form model aircraft flying time design efforts aimed stable per formance engineering plane stay out end control lines Lead-out rake outboard wing tip weight engine thrust offset rudder trim other under pinnings successful CL flight still being worked out Jim Walker traveling country popularizing CL flight demonstrations Fireball flew counterclock \ I 0 Bipe deBolts first kit introduced 1945 Though CL flying new relatively unknown activity design workedit stable easy fun fly stayed out end lines good trainer needed 50000 kits produced sold model long tail moment Its wing span 22 200 sq area flat bottom airfoils cI Super Bipe came out 1948 third Bipe series final development deBolts biplane designs larger symmetrical airfoils model shorter tail moment larger elevators side-mounted engine 28-in span 200 sq wing area aerobatic earlier ones 68 Model Aviation Left An lnfantwagon powered Fox 049 engine built Fred Bridgeman 0 santa Ana CA K&B came out its Tirst hA en gine Infant Hal soon responded lnfantwagon earliest small Stunters quickly accepted modelers thou sands kits sold Right Another Stuntwagon 30 built photographed 1950s Ward VanDuzer remembers fondly wise direction way almost CL flying done today Hal deBolt took different approach him seemed logical fly clockwise let engine torque effect sist keeping aircraft tight lines 0 Though could built flying either direction Hals CL designs set up clockwise flying other fliers followed lead Hals analytical approach design evident Bipe successful flier ideal CL trainer time greatly needed Bipes long tail mo C ment small elevators contributed its stability Hal used two wings get area compact layout working out ex treme stagger arrangement close-togeth er placement top bottom fu selage no loss efficiency made construction easy strong An interesting design feature twoII untwagon debuted 1948 Hals full-house all-out Stunt machine Fast exciting designed 60-size en gines 70-ft lines featured 58-in wingspan 667 sq wing area large fully symmetrical thick airfoil short tail moment novel time Construction methods de veloped give Stuntwagon its strength still relevant today American Sr came out 1951 51-in wingspan 510 sq wing area designed powered 29 35size engines Its still popular designs Old-Timer Stunt competition today lightly constructed featured larger inboard wing panel deBolts asymmetrical stability idea Hal intended American series designs primarily aero batic trainers Stuntwagon top competition model May 1990 69 Left The Sportwing unique design Hal developed early 50s sport flying true flying wing elevators built wing trailing edge too sensitive all-out Stunt flying made fabulous sport flier example built Barry Baxter Cypress CA still flies today Old-Timer fun Right Ward VanDuzer center poses deBolt Sportwing two Con trol Line flying buddies back 1950s front Richs Hobbytowne well-known New Jersey center CL aeromodeling time Mtesting popularity deBolt designs newly built American Senior recently photographed Old-Timer Stunt meet Right Another new American Sr gorgeous ship built current top competitive flier Kaz Minato wasnt born Hal designed airplane high-tech new-wave graphics finish brings 1951 classic design right up 1980s looks great degree negative incidence setting rear wing allowed top wing stall first slow speeds early days CL remember flying done upright addition compared what have today available engine power wasnt substan tial first Bipe powered Brown Jr Tiger Aero other en gines used later editions Bipes built Patuxent NAS its quick acceptance told Hal modelers con sidered innovative model good way get Control Line flying As Hal approached end military service modeling buddies Navy draftsman offered plan drafting Bipe Hal would produce aircraft commercially point deflolt decided make model aircraft de signing kit manufacturing full-time business Out Navy back home Buffalo NY founded Dmeco deBolt Model Engineering Company using savings $2000 Initially one-man op eration Dmeco began producing adver tising Bipe kits 1945 orders poured Hals father others stepping help Dmeco produced Ripe kits next two years Eventually 50000 kits shipped second plane series called New Bipe deBolt increased wing area added symmetrical airfoils Fi nally 1948 came Super Bipe creased wing area thicker symmetrical air foils side-mounted engine large ele vators Super Ripe aerobatic its predecessors Around time however competitive Aerobatics flying taking hold modelers losing interest biplanes promised less successful competition monoplanes Hal turned design efforts con ventional monowing aircraft Aside Bipes later monowing Aerobatic aircraft Hal directed much Control Line work toward Speed events thats competitive ac Continued page 182 Left deBolts Super Wildcat ship first design inverted flight Unique time Hal used fully symmetrical wing New techniques design flying learned Fran Ptaskiewicz Tonawanda NY took old photo model powered ignition Mccoy 49 engine Right Continental deBolts last Control Line design effort Stunter based Goodyear racers 1950s model recently built Paul Rundell Topeka KS keeping designs vintage found old K&B Glo-Torp 29 power 70 Model Aviation Clifton NJ posing Fox 35-powered American Sr 1952 John has active years pro moting Old-Timer Stunt competition As photo attests has involved CL Stunt flying almost since very beginning An old 1950s photo Ward VanDuzers Sparta NJ deBolt-designed American Jr sans engine Ward hand painted flame trim leading edge wing SAVE YOUR FIELD SNUF-LER muffler isa low cost easy install lightweight Sound reducing muffler no performance penalty answer AMA muffler rule suggestions saving flying fields Meets AMA muffler rule suggestions 3 10 decibels quieter stock muffler No power loss possible 300-500 RPM incresse Improves engine idle s better fuel economy Easily attached 25-108 stock mufflers Heat corrosion resistant Black E coat finish No special adapters required Weighs 35 ozs Fits ASP BRAT ENYA FOX HP IRVINE K & B OS MAX ROYAL YS SUPER TIGRE mufflers available hobby shop ORDER DIRECT immediate shipment Check MO Visa MC COD SEND 250 STAMP accepted Add $2SOfor UPS $2Otfor COD t% salestax FOR ADDITIONAL INFO h Calif resident AND JTEC CATALOG CL Combat/Johnson Continued page 178 youre willing take weight penalty using ABC piston/liner set rather AAC about other concessions af ter market need make better head button full-complement bearing connect ing rod RPMalthough stockers have proven work pretty well have enough clearance have chance making Blad der Grabber should time youll probably witness contest well talking about decades Americans vs Russians about British Could handle 36powered model deBolts Classic/Sarpolus Continued page 70 tivity focused well Dmeco line cluded variety Dmeco Specials Speedwagons different sizes successive ver sions incorporating latest Speed design ideas Dmeco advertising frequently listed wins deBolts models Speed competi tions along lots ballyhoo like Dmeco sensation 46 Speedwagons take over 48 nations fastest mod els Home Design-Engineered Models companys motto Inverted flight big breakthrough CL flying Though may hard imagine today pioneers era designing controlling aircraft fly inverted quite challenge Fliers attempting over country Hal heard done California too began work design verted flight capability keep kit company going Hals design ef forts usually intended commercial pro duction decided Scale kit lat est venture Navy background Grumman Wildcat made logical choice proto type full symmetrical airfoil course necessity Hal aligned elevator wing thrust line Wildcat fully builtup sheeted fuselage good scale appearance During its first attempt inverted flight Wildcat crashed its second lap Inverted flight techniques learned practicing aircraft took much work build seemed wrong Hal So get air faster intending strictly interim measure fashioned solid wood slab-type fuselage became known profile construction technique Hal may have first try Con trol Line modeling Several notable CL industry people saw Dmeco experimental inverted flight Wildcat before long other profile CL aircraft kits ap peared market Hal unwittingly started trend since profiles found estab lished place design construction technique Dmeco continued produce Wildcat kit 1948 though Hal gone fullhouse no-holds-barred Aerobatic design called Stuntwagon became famous Hal deBolts aircraft events early days Aerobatics wasnt flown precise controlled pattern maneu vers sees today originated fast fu rius event flown large engines high speeds long lines contests included Continued page 184 182 Model Aviation SN U F-FLEWTM MUFFLER Patented $2495 CAT NO BOO free-style pattern segment pilot flew own menu maneuvers Such maneu vers ioop wingovera wingover eight loops along waywere common along point-down triangles three-leaf clovers flip-flop eights showmanship flying kneeling fly ing either hand etc As typical deBolts designs Stuntwag aerodynamically clean Hal thought 60-size engine larger aircraft swer windy weather flying capahility gave Wagon generous 667-sq-in wing area Though increased thickness symmetrical airfoil still fast airplane prototype model lost wing folded during flightan instructive accident led Hal build thicker wing increased strength maneuvering ability Stuotwag drop-off landing gear less drag higher speeds OTS competitors today may note later Stuntwagons utilized fixed sheet aluminum landing gear similar deBolts American designs Using very short tail moment arm mak ing elevator area large produced required maneuverability balance Stuntwagons nose length varied suit weight en gine used tapered wing planform straight leading edge swept-forward trail ing edge time deBolt worked out con struction techniques wing strength light ness anticipated contemporary standard upper lower main spars sheeted leading trailing edges rib cap strips diagonal brac ing between spars Hal powered Stuntwag ons engines such Atwood lighter Hornets McCoys some fliers used flew 70-ft lines wanted plane fast course rivalry among big names Aerobatics Hal recalls certain meet Orwick engine people claimed Yates Madman powered firms new en gine fastest Stunter around Hal disputed stopwatches backed him up Stuntwagon turning 105 mph versus Madmans 85 mph After news came West Coast about Palmers use wing flaps Hal tried Stuntwagon Probably due very short tail moment model used wing flaps brought no added benefit Hal went design kit Stuntwagon 30 smaller version popular 29 engines K&B brought out first engine Infant Hal responded Infantwagon earliest small Stunters good move since Omeco sold thousands lnfantwagon kits last phase Stuntwagon development lighter version built 35 en gine power Hal says flew well shorter 60ft lines never kitted Following Stuntwagons Hal went de sign American series American Senior best known series quite popular OTS competition today its large wing area thick airfoil 35 power make easy-tohandle capable flier Hal considered Stuntwagon ultimate Aerobatics competition American aircraft conceived introduction Aerobatics series comprised four sizes various engine ratings small est profile fuselage no landing gear larger versions used full built-up fu selage conventional sheet aluminum landing gear Hal remembers own American Sen ior flew better him Fox 29 thought added power Fox 35 made difficult maneuver well l9-powered American Junior proved nicest-flying air craft seriesone designs real joy fly seem fly themselves controversial design feature Americans longer inboard wing pan el Hal used provide asymmetrical stability Moving fuselage outboard wing orized would counterbalance weight drag control lines result lighter efficient aircraft dispute the ory today use variable lead-out rake adjustable tip weight etc trim Americans As Hals other CL designs Americans set up clockwise flying Most however probably built generally ac cepted counterclockwise flying unique aircraft Dmeco line th Sportwing before inception th Combat event Sportwing true fly ing wing designed its name implies spot flying An abbreviated fuselage held engine landing gear vertical fin wing ta pered swept forward elevator hinged rear Sportwing remem being sensitive exciting fun Though certainly aerobatic model lively true Stunt competition Another Hals uncommon Aerobati aircraft twin-engine-powered Stunter fe two 049s A/I Twin Styled after Grutr man Skyrocket exciting easy-buildin design final deBolt CL Aerobatic design th Continental medium-sized airplane powere engines 29-35 range As usual very clean airplane resembling Goodyear P Ion Racers period Its now seen occasiot ally around OTS circles 184 Model Aviation Dmeco kits regarded top quality wood included materials best application parts well machined accurate plans clear easy follow Being active flier competitor himself Hal would conduct extensive personal testing before incorporating idea kits using what found work well Hal structed employees work kit going buy themselves No bad wood used would also tell custom ers kits better because made skilled model builders design en gineering strived light weight strength simplicity construction minimum parts Though todays sophisticated kits have extensive prefabrication include specialized hardware day Hals kits among best As far know deBolt CL Aero batic designs published magazine con struction article Hal did design work exclu sively Dmeco kits Fortunately OldTimer CL fans plans Aerobatic designs available today years ago Hal arranged copyright release CL de signs Fran Ptaszkiewicz early Dmeco em ployee authorized Fran sell plan copies deBolt designs listing avail able plans contact Fran 23 Marlee Drive Ton awanda NY 14150 Asked pick favorite CL Aerobatic design Hal chose Ripe since aircraft started everything off sheer aerobatic per formance though big Stuntwagon claims loyalty speed excitement 100-mph maneuvering 70-ft lines noise feel airplane combine make fav orite Stuntwagon among models Hal takes pride hes bit sur prised American Senior seems better known popular OTS activity day Fran Ptaszkiewicz presents some interesting formation about early CL days worked Dmeco enjoyed flying de Bolt Most Hals employees modelers encouraged Hal compete no model building done during working hours Dmeco boss Hal went con tests took along local youngsters possible offering opportunity com pete Hal provided free travel times boys would camp overnight tents con test sites Hal took modelers Buffalo meets Cleveland Mirror meets New York Nationals Olathe Dallas Fran remem bers great years great times Hal Seeing racks models Hals station wag few complained professionalism com petition course group excursions anything factory teams some times taken simply Hals method getting kids models meets Fran recalls Hal arrived certain meet told professional team welcome compete Hal quickly responded agreeing enter requested boys should permitted fly Later day Hal asked serve Stunt event judge did offered constructive criticism flier became interested Old-Timer Stunt flying usual sentimental reasons several years ago Looking around OTS design build recalled having owned Stuntwagon 30 back Continued page 187 0 TOWER HOBBIEU has Mighty Lit worlds first premium grade lIght ptywood Bonds easily CA time right. use Mighty LIte TOWERSrOwERS Special StockSuggestedSPECIAL NumberRetailPRICE HEO 100 1/8x6x121560/6pcs 1299lEpcs HEOllO 1/8x12x244950/6pcs 349916pcs HEO12O 1 /8xl 2x48 4650/3pcs 329g/3pcs Call toll free 1-800-637-6050 Refer ad 01066 May1990 185 Ditectftom PATTERN TEE 320-ET uie Cteek Ct San Jo Ca 95125 Te14Ci298-Q3II Ft4Q829i-53S 1950s also Dmeco Sportwing moat Americans Building large Stuntwagon appealed time around dered set plans Fran Ptaszkiewicz began construction powered updated Stuntwagon Su perTigre 46 incorporated wing tip weight compartment adjustable lead-out guide trimming As OTS rules prohibit drop-off landing gear t added sheet aluminum gear Wagon presumably deBolt used later versions Modern glues hardware made better job could have managed back also used muffler pretty much unknown former days airplane finished off butyrate dope Im enjoying refly ing good old days working Stuntwagon thinking about vintage days Control Line Stunt par ticularly deBolt aircraft carried corres pondence Hal now living Florida re lated some history Dmeco Control Line projects Fran Ptaszkiewicz added information few nice letters Putting article together interesting fun help Mike Keville PAMPA newsletter editor OTS enthusiast able round up photos deBolt CL aircraft modelers across country After Hal Dmeco him shifted Control Line Radio Control activity came equally renowned top designer competitor arena Though better remem bered today achievements RC Hal will never lose standing influen tial designers competitors halcyon days Control Line modeling classic CL designs will flying long time come FlyWorm/de Vries Continued page 75 along inner tube walls ejected opening rear end outer spiral propulsion fins keep airstream whirling around outer tube surface sist propelling craft superpropul sion combination spiraling air cur rents both outside tubular wing angle tube placed line flight sustain craft atr COST elimination parts smaller size combination propul sion lift power principles unit structurally adapting itself mass pro duction should bring sales price aircraft within reach great majority people question mod ern factory equipment quantity produc tion price should compare cheapest automobile today Wouldnt have wonderful actually worked author wishes thank Jack Bol Denver CO sharing discovery FlyWorm certainly invention worth uncovering FF Duration/Linstrum Continued page 77 three grams perhaps fuselage must gram sturdier sustain torque whole drive system mere four grams Compare Telco full tank 15 grams MRC Electric 30 grams obvious model lifting heavy power source will climb less thus have less duration heavier motor less efficient ob taining time aloft will get weight effi ciency system dividing total thrust im pulse weight drive unit comes surprise rubber small models still king twice efficiency electricand mercymy favored CO2 drive limps behind last place beauty rubber motors lies fact torque weight duration can modified will suit individual application feel model should climb faster add few strands dont want increase weight shorten loops Infinite possiblilites exist within wide limits Efficiency 87% Electric efficiency 40% goes up Sanyo cells lighter regular Ni Cds Models limited size make mo tor CO2 efficiency 30% Telco compar atively smallthe thrust developed hardly enough keep 25-gram model level flight thrust up notch model will climb dead air flights including glide about minute picture changes rapidly larger CO2 motors brown MJ-70 displaces 70cc will keep 52-gram model aloft three minutes dead air Brown t40 twin two tanks beats rubber performance largest mo tor will run 6-in prop specified AMA rules Czech Modela Cox 020 CO2 Da vis conversion require much larger props can used AMA competition have slightly edited Fritzs remarks HANGAR-7 RIG & C/L MODELS Proffesional Neans Quality Results Cazaorsp1et IKvit PreCut AAA Raisa & Ply PrePonred Landing Gear Spruce & Maple Wood PuliSize Roiled Plans tsstructmons Wheels Controls Etc Inciuded 13 Plin~s Pls-a Kvit shove except 5CUI parts handy temptate sheet provided C PThnas Os-sly Fulisize rolled pians tesplate sheet instructions shipped rirot class sail Free Catalog $59 C $11 Rid CORSAIR 25 Distinctive Gull Wing Pavoritet SemiScale Wing Spant 4k Wing Arear 410 sq Sn Lengtht 341/2 LoadnE 5 Sq Pt Weigh 31/211 Onginet 25 o Sad 4Chasoe S A 7 C $7 tR/C HORNET 574 Spoda Wing Spant 27 WanSq25 Lnadingt il Sz/Sqna ueefl gee $ 13 $9 N/C r Wing Spon iI Wins areat 375 Sq In. Length 351/2 Weightt $39 13 $25 C $9 C/LI DROPIADER 4G nugnip Proflie Fuselage i guiltI Spant 55i/i Areat 540 Sq In. Enginet 40 $24 13 $15 C $7 39 13 S25 C 9 aprenaive Sight Profile Fuselage & RuiltIp Sheeted Wing Wing Spant 52 Areat 435 Sq Sn Enginet 35 Stunt ai~Y C/LI5 Lov Prof ile Fuselage & Soiid Raisa 05055 osog 293/5 Area 305 Sq Engine iS Cu C/LI tilfIE 5255 iS $ 2 2 Sport Piper/Tramoeoi guiltUp Sheeted Wings & Fuseloge Wiog Spant $ reat 200 Sq $7 Dealer Inquiries Invited ORDER YOURS TODAY Please add $4 shipping & handling Send check ar tooney order VISA & MC accepted Ojur street address kits pisese credit cards W STANGEL ENTERPRISES PO BOX 336 Pit t4i4 5484172 WAUKESHA WISCONSiN S31g70338 MEMBER EAA AMA May1990 187 Ideal 4-ycle F3A & AMA fl1ng Basic Ki Pre-tab -Beetle TMSuperStar 6 Basic -built Kit 1S2951 NEW Narukes Silent st 2 4-cycle

Fran Ptaskiewicz photographed 1946 Ripe Originally powered Ohisson & Rice 23 Fran says needed added power DeLong 30 fly well Fran early employee Hal deBolts kit company has good memories early days both working Hal competing him Control Line meets CONTROL LINE modelers have tak ing Old-Timer Stunt flying OTS short greater numbers recent years OTS event rules call aircraft de signs dating prior December 31 1952 aerobatic pattern flown outlined 195 1-52 AMA rule book popularity nostalgia vintage events cuts across modeling categories Control Line OTS paralleled SAM Society Antique Modelers Old-Timer events Free Flight Radio Control terest early RC models prompted re cent formation Vintage Radio ConHal deBolts trol Society Probably thing draws modelers Old-Timer events lower level competitive pressure con tests tend fun oriented em phasis social gatherings camaraderie rather win-at-all-costs competition Models SAM Old-Timer Free Flight Radio Control events must de signs originally built no later De cember 1942 cutoff date An tique SAM designs December 1938 Vintage RC Society looking three cate gories Early Antique designs originat ing prior December 31 1950 Early Bird models dating 1951 through December 1955 Vintage designs Classic CL Stunters look innovator Hal deBolts tremendous impact early days Control Line flying great contribution designs have made sport U Dick Sarpolus Two nice shots Super Ripe ship built Jim Lee powered K&B 40 Super Bipe introduced 1948 third series acrobatic deBolts biplane designs fully symmetrical airfoils shorter tail moment larger elevators original Ripe Super Ripe evolved excellent popular CL trainer As CL Aerobatics progressed monoplanes came own superior performers Bipes fell out favor course Hal early became pacesetter monoplane design well 66 Model Aviation famous Ripe design got Hal deRolt business 1948 photo taken Fran Ptas kiewicz shows Hals original Ripe particular model powered Drone Diesel originating between January 1956 De cember 1965 Control Line Old-Timer Stunt de signs must December 31 1952 ear lier vintage Currently under discussion CL Nostalgia category would lim ited 25-year-old designs idea continually open door different aircraft designs Old-Timer events attract participants ages Often models go back farther modelers repli cating models introduced before bornand having great time fly ing Other modelers indeed going back time re-creating designs flew years ago Today course can better materialsstronger glues better coverings paints smoother powerful engines cases latter-day ver sions classic designs fly perform better prototypes truly want go back old days can still build silkspan dope complete authenticity can add reproduction ignition engine Whether Control Line Free Flight RC finding plans vintage models isnt much problem wide spread interest older designs plan repro ductions available quite few sources Everyone involved nostalgia flight has own favorites among old designs whove sport long enough probably favor aircraft flew back Fifties Sixties OTS circles designer mentioned Hal deBolt As long time competitor designer kit manufac turer Hal deservedly AMA Hall Fame Though probably best known today achievements RC has also active Control Line Free Flight over years keep winning techniques secret Hal has consistently reached out other modelers assistHals 1948-designed Stuntwagon recently built author left see its bare bones right finished model Hals con struction techniques set pace futuresheeted leading trailing edges top bottom spars reinforcing spar diagonals rib cap stripsall 1948 Stuntwagon first designs capable todays CL Stunt routines both structurally aerodynamically May 1990 67 Two very nice views classy Bipe built Ron Kirchner Encino CA Ron presently flies gem Control Line exhibitions shows Its powered Testor/McCoy 29 engine Doug Dahike photographed back 1979 Old-Timer Stunt competition holding deBolt-designed Stuntwagon 30 Hal de signed kitted smaller version Stuntwagon popular 29 engines John Miske photographed 1950 Stuntwagon 30 powered Dooling 29 ance encouragement Hal pivotal growth Con trol Line modeling branch story CL aircraft designs encapsulates history CL competition development Hal always th leading edge tech nology early days CL compe tition aircraft performance helped set format competitive events favored Speed Racing events both CL RC competition commenting Aerobatics competition demands prac 0 hes ever time cer tainly didnt stop Hal however coming top Aerobatics competitor excellent aircraft hes developed Hal deBolt began flying Control Line earnest serving Patuxent River Naval Air Station Maryland during 1940s An airplane modeling group known Navy Patuxent River Model Engi neers organized recreational activity understand club still ac / tive today Control Line newest form model aircraft flying time design efforts aimed stable per formance engineering plane stay out end control lines Lead-out rake outboard wing tip weight engine thrust offset rudder trim other under pinnings successful CL flight still being worked out Jim Walker traveling country popularizing CL flight demonstrations Fireball flew counterclock \ I 0 Bipe deBolts first kit introduced 1945 Though CL flying new relatively unknown activity design workedit stable easy fun fly stayed out end lines good trainer needed 50000 kits produced sold model long tail moment Its wing span 22 200 sq area flat bottom airfoils cI Super Bipe came out 1948 third Bipe series final development deBolts biplane designs larger symmetrical airfoils model shorter tail moment larger elevators side-mounted engine 28-in span 200 sq wing area aerobatic earlier ones 68 Model Aviation Left An lnfantwagon powered Fox 049 engine built Fred Bridgeman 0 santa Ana CA K&B came out its Tirst hA en gine Infant Hal soon responded lnfantwagon earliest small Stunters quickly accepted modelers thou sands kits sold Right Another Stuntwagon 30 built photographed 1950s Ward VanDuzer remembers fondly wise direction way almost CL flying done today Hal deBolt took different approach him seemed logical fly clockwise let engine torque effect sist keeping aircraft tight lines 0 Though could built flying either direction Hals CL designs set up clockwise flying other fliers followed lead Hals analytical approach design evident Bipe successful flier ideal CL trainer time greatly needed Bipes long tail mo C ment small elevators contributed its stability Hal used two wings get area compact layout working out ex treme stagger arrangement close-togeth er placement top bottom fu selage no loss efficiency made construction easy strong An interesting design feature twoII untwagon debuted 1948 Hals full-house all-out Stunt machine Fast exciting designed 60-size en gines 70-ft lines featured 58-in wingspan 667 sq wing area large fully symmetrical thick airfoil short tail moment novel time Construction methods de veloped give Stuntwagon its strength still relevant today American Sr came out 1951 51-in wingspan 510 sq wing area designed powered 29 35size engines Its still popular designs Old-Timer Stunt competition today lightly constructed featured larger inboard wing panel deBolts asymmetrical stability idea Hal intended American series designs primarily aero batic trainers Stuntwagon top competition model May 1990 69 Left The Sportwing unique design Hal developed early 50s sport flying true flying wing elevators built wing trailing edge too sensitive all-out Stunt flying made fabulous sport flier example built Barry Baxter Cypress CA still flies today Old-Timer fun Right Ward VanDuzer center poses deBolt Sportwing two Con trol Line flying buddies back 1950s front Richs Hobbytowne well-known New Jersey center CL aeromodeling time Mtesting popularity deBolt designs newly built American Senior recently photographed Old-Timer Stunt meet Right Another new American Sr gorgeous ship built current top competitive flier Kaz Minato wasnt born Hal designed airplane high-tech new-wave graphics finish brings 1951 classic design right up 1980s looks great degree negative incidence setting rear wing allowed top wing stall first slow speeds early days CL remember flying done upright addition compared what have today available engine power wasnt substan tial first Bipe powered Brown Jr Tiger Aero other en gines used later editions Bipes built Patuxent NAS its quick acceptance told Hal modelers con sidered innovative model good way get Control Line flying As Hal approached end military service modeling buddies Navy draftsman offered plan drafting Bipe Hal would produce aircraft commercially point deflolt decided make model aircraft de signing kit manufacturing full-time business Out Navy back home Buffalo NY founded Dmeco deBolt Model Engineering Company using savings $2000 Initially one-man op eration Dmeco began producing adver tising Bipe kits 1945 orders poured Hals father others stepping help Dmeco produced Ripe kits next two years Eventually 50000 kits shipped second plane series called New Bipe deBolt increased wing area added symmetrical airfoils Fi nally 1948 came Super Bipe creased wing area thicker symmetrical air foils side-mounted engine large ele vators Super Ripe aerobatic its predecessors Around time however competitive Aerobatics flying taking hold modelers losing interest biplanes promised less successful competition monoplanes Hal turned design efforts con ventional monowing aircraft Aside Bipes later monowing Aerobatic aircraft Hal directed much Control Line work toward Speed events thats competitive ac Continued page 182 Left deBolts Super Wildcat ship first design inverted flight Unique time Hal used fully symmetrical wing New techniques design flying learned Fran Ptaskiewicz Tonawanda NY took old photo model powered ignition Mccoy 49 engine Right Continental deBolts last Control Line design effort Stunter based Goodyear racers 1950s model recently built Paul Rundell Topeka KS keeping designs vintage found old K&B Glo-Torp 29 power 70 Model Aviation Clifton NJ posing Fox 35-powered American Sr 1952 John has active years pro moting Old-Timer Stunt competition As photo attests has involved CL Stunt flying almost since very beginning An old 1950s photo Ward VanDuzers Sparta NJ deBolt-designed American Jr sans engine Ward hand painted flame trim leading edge wing SAVE YOUR FIELD SNUF-LER muffler isa low cost easy install lightweight Sound reducing muffler no performance penalty answer AMA muffler rule suggestions saving flying fields Meets AMA muffler rule suggestions 3 10 decibels quieter stock muffler No power loss possible 300-500 RPM incresse Improves engine idle s better fuel economy Easily attached 25-108 stock mufflers Heat corrosion resistant Black E coat finish No special adapters required Weighs 35 ozs Fits ASP BRAT ENYA FOX HP IRVINE K & B OS MAX ROYAL YS SUPER TIGRE mufflers available hobby shop ORDER DIRECT immediate shipment Check MO Visa MC COD SEND 250 STAMP accepted Add $2SOfor UPS $2Otfor COD t% salestax FOR ADDITIONAL INFO h Calif resident AND JTEC CATALOG CL Combat/Johnson Continued page 178 youre willing take weight penalty using ABC piston/liner set rather AAC about other concessions af ter market need make better head button full-complement bearing connect ing rod RPMalthough stockers have proven work pretty well have enough clearance have chance making Blad der Grabber should time youll probably witness contest well talking about decades Americans vs Russians about British Could handle 36powered model deBolts Classic/Sarpolus Continued page 70 tivity focused well Dmeco line cluded variety Dmeco Specials Speedwagons different sizes successive ver sions incorporating latest Speed design ideas Dmeco advertising frequently listed wins deBolts models Speed competi tions along lots ballyhoo like Dmeco sensation 46 Speedwagons take over 48 nations fastest mod els Home Design-Engineered Models companys motto Inverted flight big breakthrough CL flying Though may hard imagine today pioneers era designing controlling aircraft fly inverted quite challenge Fliers attempting over country Hal heard done California too began work design verted flight capability keep kit company going Hals design ef forts usually intended commercial pro duction decided Scale kit lat est venture Navy background Grumman Wildcat made logical choice proto type full symmetrical airfoil course necessity Hal aligned elevator wing thrust line Wildcat fully builtup sheeted fuselage good scale appearance During its first attempt inverted flight Wildcat crashed its second lap Inverted flight techniques learned practicing aircraft took much work build seemed wrong Hal So get air faster intending strictly interim measure fashioned solid wood slab-type fuselage became known profile construction technique Hal may have first try Con trol Line modeling Several notable CL industry people saw Dmeco experimental inverted flight Wildcat before long other profile CL aircraft kits ap peared market Hal unwittingly started trend since profiles found estab lished place design construction technique Dmeco continued produce Wildcat kit 1948 though Hal gone fullhouse no-holds-barred Aerobatic design called Stuntwagon became famous Hal deBolts aircraft events early days Aerobatics wasnt flown precise controlled pattern maneu vers sees today originated fast fu rius event flown large engines high speeds long lines contests included Continued page 184 182 Model Aviation SN U F-FLEWTM MUFFLER Patented $2495 CAT NO BOO free-style pattern segment pilot flew own menu maneuvers Such maneu vers ioop wingovera wingover eight loops along waywere common along point-down triangles three-leaf clovers flip-flop eights showmanship flying kneeling fly ing either hand etc As typical deBolts designs Stuntwag aerodynamically clean Hal thought 60-size engine larger aircraft swer windy weather flying capahility gave Wagon generous 667-sq-in wing area Though increased thickness symmetrical airfoil still fast airplane prototype model lost wing folded during flightan instructive accident led Hal build thicker wing increased strength maneuvering ability Stuotwag drop-off landing gear less drag higher speeds OTS competitors today may note later Stuntwagons utilized fixed sheet aluminum landing gear similar deBolts American designs Using very short tail moment arm mak ing elevator area large produced required maneuverability balance Stuntwagons nose length varied suit weight en gine used tapered wing planform straight leading edge swept-forward trail ing edge time deBolt worked out con struction techniques wing strength light ness anticipated contemporary standard upper lower main spars sheeted leading trailing edges rib cap strips diagonal brac ing between spars Hal powered Stuntwag ons engines such Atwood lighter Hornets McCoys some fliers used flew 70-ft lines wanted plane fast course rivalry among big names Aerobatics Hal recalls certain meet Orwick engine people claimed Yates Madman powered firms new en gine fastest Stunter around Hal disputed stopwatches backed him up Stuntwagon turning 105 mph versus Madmans 85 mph After news came West Coast about Palmers use wing flaps Hal tried Stuntwagon Probably due very short tail moment model used wing flaps brought no added benefit Hal went design kit Stuntwagon 30 smaller version popular 29 engines K&B brought out first engine Infant Hal responded Infantwagon earliest small Stunters good move since Omeco sold thousands lnfantwagon kits last phase Stuntwagon development lighter version built 35 en gine power Hal says flew well shorter 60ft lines never kitted Following Stuntwagons Hal went de sign American series American Senior best known series quite popular OTS competition today its large wing area thick airfoil 35 power make easy-tohandle capable flier Hal considered Stuntwagon ultimate Aerobatics competition American aircraft conceived introduction Aerobatics series comprised four sizes various engine ratings small est profile fuselage no landing gear larger versions used full built-up fu selage conventional sheet aluminum landing gear Hal remembers own American Sen ior flew better him Fox 29 thought added power Fox 35 made difficult maneuver well l9-powered American Junior proved nicest-flying air craft seriesone designs real joy fly seem fly themselves controversial design feature Americans longer inboard wing pan el Hal used provide asymmetrical stability Moving fuselage outboard wing orized would counterbalance weight drag control lines result lighter efficient aircraft dispute the ory today use variable lead-out rake adjustable tip weight etc trim Americans As Hals other CL designs Americans set up clockwise flying Most however probably built generally ac cepted counterclockwise flying unique aircraft Dmeco line th Sportwing before inception th Combat event Sportwing true fly ing wing designed its name implies spot flying An abbreviated fuselage held engine landing gear vertical fin wing ta pered swept forward elevator hinged rear Sportwing remem being sensitive exciting fun Though certainly aerobatic model lively true Stunt competition Another Hals uncommon Aerobati aircraft twin-engine-powered Stunter fe two 049s A/I Twin Styled after Grutr man Skyrocket exciting easy-buildin design final deBolt CL Aerobatic design th Continental medium-sized airplane powere engines 29-35 range As usual very clean airplane resembling Goodyear P Ion Racers period Its now seen occasiot ally around OTS circles 184 Model Aviation Dmeco kits regarded top quality wood included materials best application parts well machined accurate plans clear easy follow Being active flier competitor himself Hal would conduct extensive personal testing before incorporating idea kits using what found work well Hal structed employees work kit going buy themselves No bad wood used would also tell custom ers kits better because made skilled model builders design en gineering strived light weight strength simplicity construction minimum parts Though todays sophisticated kits have extensive prefabrication include specialized hardware day Hals kits among best As far know deBolt CL Aero batic designs published magazine con struction article Hal did design work exclu sively Dmeco kits Fortunately OldTimer CL fans plans Aerobatic designs available today years ago Hal arranged copyright release CL de signs Fran Ptaszkiewicz early Dmeco em ployee authorized Fran sell plan copies deBolt designs listing avail able plans contact Fran 23 Marlee Drive Ton awanda NY 14150 Asked pick favorite CL Aerobatic design Hal chose Ripe since aircraft started everything off sheer aerobatic per formance though big Stuntwagon claims loyalty speed excitement 100-mph maneuvering 70-ft lines noise feel airplane combine make fav orite Stuntwagon among models Hal takes pride hes bit sur prised American Senior seems better known popular OTS activity day Fran Ptaszkiewicz presents some interesting formation about early CL days worked Dmeco enjoyed flying de Bolt Most Hals employees modelers encouraged Hal compete no model building done during working hours Dmeco boss Hal went con tests took along local youngsters possible offering opportunity com pete Hal provided free travel times boys would camp overnight tents con test sites Hal took modelers Buffalo meets Cleveland Mirror meets New York Nationals Olathe Dallas Fran remem bers great years great times Hal Seeing racks models Hals station wag few complained professionalism com petition course group excursions anything factory teams some times taken simply Hals method getting kids models meets Fran recalls Hal arrived certain meet told professional team welcome compete Hal quickly responded agreeing enter requested boys should permitted fly Later day Hal asked serve Stunt event judge did offered constructive criticism flier became interested Old-Timer Stunt flying usual sentimental reasons several years ago Looking around OTS design build recalled having owned Stuntwagon 30 back Continued page 187 0 TOWER HOBBIEU has Mighty Lit worlds first premium grade lIght ptywood Bonds easily CA time right. use Mighty LIte TOWERSrOwERS Special StockSuggestedSPECIAL NumberRetailPRICE HEO 100 1/8x6x121560/6pcs 1299lEpcs HEOllO 1/8x12x244950/6pcs 349916pcs HEO12O 1 /8xl 2x48 4650/3pcs 329g/3pcs Call toll free 1-800-637-6050 Refer ad 01066 May1990 185 Ditectftom PATTERN TEE 320-ET uie Cteek Ct San Jo Ca 95125 Te14Ci298-Q3II Ft4Q829i-53S 1950s also Dmeco Sportwing moat Americans Building large Stuntwagon appealed time around dered set plans Fran Ptaszkiewicz began construction powered updated Stuntwagon Su perTigre 46 incorporated wing tip weight compartment adjustable lead-out guide trimming As OTS rules prohibit drop-off landing gear t added sheet aluminum gear Wagon presumably deBolt used later versions Modern glues hardware made better job could have managed back also used muffler pretty much unknown former days airplane finished off butyrate dope Im enjoying refly ing good old days working Stuntwagon thinking about vintage days Control Line Stunt par ticularly deBolt aircraft carried corres pondence Hal now living Florida re lated some history Dmeco Control Line projects Fran Ptaszkiewicz added information few nice letters Putting article together interesting fun help Mike Keville PAMPA newsletter editor OTS enthusiast able round up photos deBolt CL aircraft modelers across country After Hal Dmeco him shifted Control Line Radio Control activity came equally renowned top designer competitor arena Though better remem bered today achievements RC Hal will never lose standing influen tial designers competitors halcyon days Control Line modeling classic CL designs will flying long time come FlyWorm/de Vries Continued page 75 along inner tube walls ejected opening rear end outer spiral propulsion fins keep airstream whirling around outer tube surface sist propelling craft superpropul sion combination spiraling air cur rents both outside tubular wing angle tube placed line flight sustain craft atr COST elimination parts smaller size combination propul sion lift power principles unit structurally adapting itself mass pro duction should bring sales price aircraft within reach great majority people question mod ern factory equipment quantity produc tion price should compare cheapest automobile today Wouldnt have wonderful actually worked author wishes thank Jack Bol Denver CO sharing discovery FlyWorm certainly invention worth uncovering FF Duration/Linstrum Continued page 77 three grams perhaps fuselage must gram sturdier sustain torque whole drive system mere four grams Compare Telco full tank 15 grams MRC Electric 30 grams obvious model lifting heavy power source will climb less thus have less duration heavier motor less efficient ob taining time aloft will get weight effi ciency system dividing total thrust im pulse weight drive unit comes surprise rubber small models still king twice efficiency electricand mercymy favored CO2 drive limps behind last place beauty rubber motors lies fact torque weight duration can modified will suit individual application feel model should climb faster add few strands dont want increase weight shorten loops Infinite possiblilites exist within wide limits Efficiency 87% Electric efficiency 40% goes up Sanyo cells lighter regular Ni Cds Models limited size make mo tor CO2 efficiency 30% Telco compar atively smallthe thrust developed hardly enough keep 25-gram model level flight thrust up notch model will climb dead air flights including glide about minute picture changes rapidly larger CO2 motors brown MJ-70 displaces 70cc will keep 52-gram model aloft three minutes dead air Brown t40 twin two tanks beats rubber performance largest mo tor will run 6-in prop specified AMA rules Czech Modela Cox 020 CO2 Da vis conversion require much larger props can used AMA competition have slightly edited Fritzs remarks HANGAR-7 RIG & C/L MODELS Proffesional Neans Quality Results Cazaorsp1et IKvit PreCut AAA Raisa & Ply PrePonred Landing Gear Spruce & Maple Wood PuliSize Roiled Plans tsstructmons Wheels Controls Etc Inciuded 13 Plin~s Pls-a Kvit shove except 5CUI parts handy temptate sheet provided C PThnas Os-sly Fulisize rolled pians tesplate sheet instructions shipped rirot class sail Free Catalog $59 C $11 Rid CORSAIR 25 Distinctive Gull Wing Pavoritet SemiScale Wing Spant 4k Wing Arear 410 sq Sn Lengtht 341/2 LoadnE 5 Sq Pt Weigh 31/211 Onginet 25 o Sad 4Chasoe S A 7 C $7 tR/C HORNET 574 Spoda Wing Spant 27 WanSq25 Lnadingt il Sz/Sqna ueefl gee $ 13 $9 N/C r Wing Spon iI Wins areat 375 Sq In. Length 351/2 Weightt $39 13 $25 C $9 C/LI DROPIADER 4G nugnip Proflie Fuselage i guiltI Spant 55i/i Areat 540 Sq In. Enginet 40 $24 13 $15 C $7 39 13 S25 C 9 aprenaive Sight Profile Fuselage & RuiltIp Sheeted Wing Wing Spant 52 Areat 435 Sq Sn Enginet 35 Stunt ai~Y C/LI5 Lov Prof ile Fuselage & Soiid Raisa 05055 osog 293/5 Area 305 Sq Engine iS Cu C/LI tilfIE 5255 iS $ 2 2 Sport Piper/Tramoeoi guiltUp Sheeted Wings & Fuseloge Wiog Spant $ reat 200 Sq $7 Dealer Inquiries Invited ORDER YOURS TODAY Please add $4 shipping & handling Send check ar tooney order VISA & MC accepted Ojur street address kits pisese credit cards W STANGEL ENTERPRISES PO BOX 336 Pit t4i4 5484172 WAUKESHA WISCONSiN S31g70338 MEMBER EAA AMA May1990 187 Ideal 4-ycle F3A & AMA fl1ng Basic Ki Pre-tab -Beetle TMSuperStar 6 Basic -built Kit 1S2951 NEW Narukes Silent st 2 4-cycle

Fran Ptaskiewicz photographed 1946 Ripe Originally powered Ohisson & Rice 23 Fran says needed added power DeLong 30 fly well Fran early employee Hal deBolts kit company has good memories early days both working Hal competing him Control Line meets CONTROL LINE modelers have tak ing Old-Timer Stunt flying OTS short greater numbers recent years OTS event rules call aircraft de signs dating prior December 31 1952 aerobatic pattern flown outlined 195 1-52 AMA rule book popularity nostalgia vintage events cuts across modeling categories Control Line OTS paralleled SAM Society Antique Modelers Old-Timer events Free Flight Radio Control terest early RC models prompted re cent formation Vintage Radio ConHal deBolts trol Society Probably thing draws modelers Old-Timer events lower level competitive pressure con tests tend fun oriented em phasis social gatherings camaraderie rather win-at-all-costs competition Models SAM Old-Timer Free Flight Radio Control events must de signs originally built no later De cember 1942 cutoff date An tique SAM designs December 1938 Vintage RC Society looking three cate gories Early Antique designs originat ing prior December 31 1950 Early Bird models dating 1951 through December 1955 Vintage designs Classic CL Stunters look innovator Hal deBolts tremendous impact early days Control Line flying great contribution designs have made sport U Dick Sarpolus Two nice shots Super Ripe ship built Jim Lee powered K&B 40 Super Bipe introduced 1948 third series acrobatic deBolts biplane designs fully symmetrical airfoils shorter tail moment larger elevators original Ripe Super Ripe evolved excellent popular CL trainer As CL Aerobatics progressed monoplanes came own superior performers Bipes fell out favor course Hal early became pacesetter monoplane design well 66 Model Aviation famous Ripe design got Hal deRolt business 1948 photo taken Fran Ptas kiewicz shows Hals original Ripe particular model powered Drone Diesel originating between January 1956 De cember 1965 Control Line Old-Timer Stunt de signs must December 31 1952 ear lier vintage Currently under discussion CL Nostalgia category would lim ited 25-year-old designs idea continually open door different aircraft designs Old-Timer events attract participants ages Often models go back farther modelers repli cating models introduced before bornand having great time fly ing Other modelers indeed going back time re-creating designs flew years ago Today course can better materialsstronger glues better coverings paints smoother powerful engines cases latter-day ver sions classic designs fly perform better prototypes truly want go back old days can still build silkspan dope complete authenticity can add reproduction ignition engine Whether Control Line Free Flight RC finding plans vintage models isnt much problem wide spread interest older designs plan repro ductions available quite few sources Everyone involved nostalgia flight has own favorites among old designs whove sport long enough probably favor aircraft flew back Fifties Sixties OTS circles designer mentioned Hal deBolt As long time competitor designer kit manufac turer Hal deservedly AMA Hall Fame Though probably best known today achievements RC has also active Control Line Free Flight over years keep winning techniques secret Hal has consistently reached out other modelers assistHals 1948-designed Stuntwagon recently built author left see its bare bones right finished model Hals con struction techniques set pace futuresheeted leading trailing edges top bottom spars reinforcing spar diagonals rib cap stripsall 1948 Stuntwagon first designs capable todays CL Stunt routines both structurally aerodynamically May 1990 67 Two very nice views classy Bipe built Ron Kirchner Encino CA Ron presently flies gem Control Line exhibitions shows Its powered Testor/McCoy 29 engine Doug Dahike photographed back 1979 Old-Timer Stunt competition holding deBolt-designed Stuntwagon 30 Hal de signed kitted smaller version Stuntwagon popular 29 engines John Miske photographed 1950 Stuntwagon 30 powered Dooling 29 ance encouragement Hal pivotal growth Con trol Line modeling branch story CL aircraft designs encapsulates history CL competition development Hal always th leading edge tech nology early days CL compe tition aircraft performance helped set format competitive events favored Speed Racing events both CL RC competition commenting Aerobatics competition demands prac 0 hes ever time cer tainly didnt stop Hal however coming top Aerobatics competitor excellent aircraft hes developed Hal deBolt began flying Control Line earnest serving Patuxent River Naval Air Station Maryland during 1940s An airplane modeling group known Navy Patuxent River Model Engi neers organized recreational activity understand club still ac / tive today Control Line newest form model aircraft flying time design efforts aimed stable per formance engineering plane stay out end control lines Lead-out rake outboard wing tip weight engine thrust offset rudder trim other under pinnings successful CL flight still being worked out Jim Walker traveling country popularizing CL flight demonstrations Fireball flew counterclock \ I 0 Bipe deBolts first kit introduced 1945 Though CL flying new relatively unknown activity design workedit stable easy fun fly stayed out end lines good trainer needed 50000 kits produced sold model long tail moment Its wing span 22 200 sq area flat bottom airfoils cI Super Bipe came out 1948 third Bipe series final development deBolts biplane designs larger symmetrical airfoils model shorter tail moment larger elevators side-mounted engine 28-in span 200 sq wing area aerobatic earlier ones 68 Model Aviation Left An lnfantwagon powered Fox 049 engine built Fred Bridgeman 0 santa Ana CA K&B came out its Tirst hA en gine Infant Hal soon responded lnfantwagon earliest small Stunters quickly accepted modelers thou sands kits sold Right Another Stuntwagon 30 built photographed 1950s Ward VanDuzer remembers fondly wise direction way almost CL flying done today Hal deBolt took different approach him seemed logical fly clockwise let engine torque effect sist keeping aircraft tight lines 0 Though could built flying either direction Hals CL designs set up clockwise flying other fliers followed lead Hals analytical approach design evident Bipe successful flier ideal CL trainer time greatly needed Bipes long tail mo C ment small elevators contributed its stability Hal used two wings get area compact layout working out ex treme stagger arrangement close-togeth er placement top bottom fu selage no loss efficiency made construction easy strong An interesting design feature twoII untwagon debuted 1948 Hals full-house all-out Stunt machine Fast exciting designed 60-size en gines 70-ft lines featured 58-in wingspan 667 sq wing area large fully symmetrical thick airfoil short tail moment novel time Construction methods de veloped give Stuntwagon its strength still relevant today American Sr came out 1951 51-in wingspan 510 sq wing area designed powered 29 35size engines Its still popular designs Old-Timer Stunt competition today lightly constructed featured larger inboard wing panel deBolts asymmetrical stability idea Hal intended American series designs primarily aero batic trainers Stuntwagon top competition model May 1990 69 Left The Sportwing unique design Hal developed early 50s sport flying true flying wing elevators built wing trailing edge too sensitive all-out Stunt flying made fabulous sport flier example built Barry Baxter Cypress CA still flies today Old-Timer fun Right Ward VanDuzer center poses deBolt Sportwing two Con trol Line flying buddies back 1950s front Richs Hobbytowne well-known New Jersey center CL aeromodeling time Mtesting popularity deBolt designs newly built American Senior recently photographed Old-Timer Stunt meet Right Another new American Sr gorgeous ship built current top competitive flier Kaz Minato wasnt born Hal designed airplane high-tech new-wave graphics finish brings 1951 classic design right up 1980s looks great degree negative incidence setting rear wing allowed top wing stall first slow speeds early days CL remember flying done upright addition compared what have today available engine power wasnt substan tial first Bipe powered Brown Jr Tiger Aero other en gines used later editions Bipes built Patuxent NAS its quick acceptance told Hal modelers con sidered innovative model good way get Control Line flying As Hal approached end military service modeling buddies Navy draftsman offered plan drafting Bipe Hal would produce aircraft commercially point deflolt decided make model aircraft de signing kit manufacturing full-time business Out Navy back home Buffalo NY founded Dmeco deBolt Model Engineering Company using savings $2000 Initially one-man op eration Dmeco began producing adver tising Bipe kits 1945 orders poured Hals father others stepping help Dmeco produced Ripe kits next two years Eventually 50000 kits shipped second plane series called New Bipe deBolt increased wing area added symmetrical airfoils Fi nally 1948 came Super Bipe creased wing area thicker symmetrical air foils side-mounted engine large ele vators Super Ripe aerobatic its predecessors Around time however competitive Aerobatics flying taking hold modelers losing interest biplanes promised less successful competition monoplanes Hal turned design efforts con ventional monowing aircraft Aside Bipes later monowing Aerobatic aircraft Hal directed much Control Line work toward Speed events thats competitive ac Continued page 182 Left deBolts Super Wildcat ship first design inverted flight Unique time Hal used fully symmetrical wing New techniques design flying learned Fran Ptaskiewicz Tonawanda NY took old photo model powered ignition Mccoy 49 engine Right Continental deBolts last Control Line design effort Stunter based Goodyear racers 1950s model recently built Paul Rundell Topeka KS keeping designs vintage found old K&B Glo-Torp 29 power 70 Model Aviation Clifton NJ posing Fox 35-powered American Sr 1952 John has active years pro moting Old-Timer Stunt competition As photo attests has involved CL Stunt flying almost since very beginning An old 1950s photo Ward VanDuzers Sparta NJ deBolt-designed American Jr sans engine Ward hand painted flame trim leading edge wing SAVE YOUR FIELD SNUF-LER muffler isa low cost easy install lightweight Sound reducing muffler no performance penalty answer AMA muffler rule suggestions saving flying fields Meets AMA muffler rule suggestions 3 10 decibels quieter stock muffler No power loss possible 300-500 RPM incresse Improves engine idle s better fuel economy Easily attached 25-108 stock mufflers Heat corrosion resistant Black E coat finish No special adapters required Weighs 35 ozs Fits ASP BRAT ENYA FOX HP IRVINE K & B OS MAX ROYAL YS SUPER TIGRE mufflers available hobby shop ORDER DIRECT immediate shipment Check MO Visa MC COD SEND 250 STAMP accepted Add $2SOfor UPS $2Otfor COD t% salestax FOR ADDITIONAL INFO h Calif resident AND JTEC CATALOG CL Combat/Johnson Continued page 178 youre willing take weight penalty using ABC piston/liner set rather AAC about other concessions af ter market need make better head button full-complement bearing connect ing rod RPMalthough stockers have proven work pretty well have enough clearance have chance making Blad der Grabber should time youll probably witness contest well talking about decades Americans vs Russians about British Could handle 36powered model deBolts Classic/Sarpolus Continued page 70 tivity focused well Dmeco line cluded variety Dmeco Specials Speedwagons different sizes successive ver sions incorporating latest Speed design ideas Dmeco advertising frequently listed wins deBolts models Speed competi tions along lots ballyhoo like Dmeco sensation 46 Speedwagons take over 48 nations fastest mod els Home Design-Engineered Models companys motto Inverted flight big breakthrough CL flying Though may hard imagine today pioneers era designing controlling aircraft fly inverted quite challenge Fliers attempting over country Hal heard done California too began work design verted flight capability keep kit company going Hals design ef forts usually intended commercial pro duction decided Scale kit lat est venture Navy background Grumman Wildcat made logical choice proto type full symmetrical airfoil course necessity Hal aligned elevator wing thrust line Wildcat fully builtup sheeted fuselage good scale appearance During its first attempt inverted flight Wildcat crashed its second lap Inverted flight techniques learned practicing aircraft took much work build seemed wrong Hal So get air faster intending strictly interim measure fashioned solid wood slab-type fuselage became known profile construction technique Hal may have first try Con trol Line modeling Several notable CL industry people saw Dmeco experimental inverted flight Wildcat before long other profile CL aircraft kits ap peared market Hal unwittingly started trend since profiles found estab lished place design construction technique Dmeco continued produce Wildcat kit 1948 though Hal gone fullhouse no-holds-barred Aerobatic design called Stuntwagon became famous Hal deBolts aircraft events early days Aerobatics wasnt flown precise controlled pattern maneu vers sees today originated fast fu rius event flown large engines high speeds long lines contests included Continued page 184 182 Model Aviation SN U F-FLEWTM MUFFLER Patented $2495 CAT NO BOO free-style pattern segment pilot flew own menu maneuvers Such maneu vers ioop wingovera wingover eight loops along waywere common along point-down triangles three-leaf clovers flip-flop eights showmanship flying kneeling fly ing either hand etc As typical deBolts designs Stuntwag aerodynamically clean Hal thought 60-size engine larger aircraft swer windy weather flying capahility gave Wagon generous 667-sq-in wing area Though increased thickness symmetrical airfoil still fast airplane prototype model lost wing folded during flightan instructive accident led Hal build thicker wing increased strength maneuvering ability Stuotwag drop-off landing gear less drag higher speeds OTS competitors today may note later Stuntwagons utilized fixed sheet aluminum landing gear similar deBolts American designs Using very short tail moment arm mak ing elevator area large produced required maneuverability balance Stuntwagons nose length varied suit weight en gine used tapered wing planform straight leading edge swept-forward trail ing edge time deBolt worked out con struction techniques wing strength light ness anticipated contemporary standard upper lower main spars sheeted leading trailing edges rib cap strips diagonal brac ing between spars Hal powered Stuntwag ons engines such Atwood lighter Hornets McCoys some fliers used flew 70-ft lines wanted plane fast course rivalry among big names Aerobatics Hal recalls certain meet Orwick engine people claimed Yates Madman powered firms new en gine fastest Stunter around Hal disputed stopwatches backed him up Stuntwagon turning 105 mph versus Madmans 85 mph After news came West Coast about Palmers use wing flaps Hal tried Stuntwagon Probably due very short tail moment model used wing flaps brought no added benefit Hal went design kit Stuntwagon 30 smaller version popular 29 engines K&B brought out first engine Infant Hal responded Infantwagon earliest small Stunters good move since Omeco sold thousands lnfantwagon kits last phase Stuntwagon development lighter version built 35 en gine power Hal says flew well shorter 60ft lines never kitted Following Stuntwagons Hal went de sign American series American Senior best known series quite popular OTS competition today its large wing area thick airfoil 35 power make easy-tohandle capable flier Hal considered Stuntwagon ultimate Aerobatics competition American aircraft conceived introduction Aerobatics series comprised four sizes various engine ratings small est profile fuselage no landing gear larger versions used full built-up fu selage conventional sheet aluminum landing gear Hal remembers own American Sen ior flew better him Fox 29 thought added power Fox 35 made difficult maneuver well l9-powered American Junior proved nicest-flying air craft seriesone designs real joy fly seem fly themselves controversial design feature Americans longer inboard wing pan el Hal used provide asymmetrical stability Moving fuselage outboard wing orized would counterbalance weight drag control lines result lighter efficient aircraft dispute the ory today use variable lead-out rake adjustable tip weight etc trim Americans As Hals other CL designs Americans set up clockwise flying Most however probably built generally ac cepted counterclockwise flying unique aircraft Dmeco line th Sportwing before inception th Combat event Sportwing true fly ing wing designed its name implies spot flying An abbreviated fuselage held engine landing gear vertical fin wing ta pered swept forward elevator hinged rear Sportwing remem being sensitive exciting fun Though certainly aerobatic model lively true Stunt competition Another Hals uncommon Aerobati aircraft twin-engine-powered Stunter fe two 049s A/I Twin Styled after Grutr man Skyrocket exciting easy-buildin design final deBolt CL Aerobatic design th Continental medium-sized airplane powere engines 29-35 range As usual very clean airplane resembling Goodyear P Ion Racers period Its now seen occasiot ally around OTS circles 184 Model Aviation Dmeco kits regarded top quality wood included materials best application parts well machined accurate plans clear easy follow Being active flier competitor himself Hal would conduct extensive personal testing before incorporating idea kits using what found work well Hal structed employees work kit going buy themselves No bad wood used would also tell custom ers kits better because made skilled model builders design en gineering strived light weight strength simplicity construction minimum parts Though todays sophisticated kits have extensive prefabrication include specialized hardware day Hals kits among best As far know deBolt CL Aero batic designs published magazine con struction article Hal did design work exclu sively Dmeco kits Fortunately OldTimer CL fans plans Aerobatic designs available today years ago Hal arranged copyright release CL de signs Fran Ptaszkiewicz early Dmeco em ployee authorized Fran sell plan copies deBolt designs listing avail able plans contact Fran 23 Marlee Drive Ton awanda NY 14150 Asked pick favorite CL Aerobatic design Hal chose Ripe since aircraft started everything off sheer aerobatic per formance though big Stuntwagon claims loyalty speed excitement 100-mph maneuvering 70-ft lines noise feel airplane combine make fav orite Stuntwagon among models Hal takes pride hes bit sur prised American Senior seems better known popular OTS activity day Fran Ptaszkiewicz presents some interesting formation about early CL days worked Dmeco enjoyed flying de Bolt Most Hals employees modelers encouraged Hal compete no model building done during working hours Dmeco boss Hal went con tests took along local youngsters possible offering opportunity com pete Hal provided free travel times boys would camp overnight tents con test sites Hal took modelers Buffalo meets Cleveland Mirror meets New York Nationals Olathe Dallas Fran remem bers great years great times Hal Seeing racks models Hals station wag few complained professionalism com petition course group excursions anything factory teams some times taken simply Hals method getting kids models meets Fran recalls Hal arrived certain meet told professional team welcome compete Hal quickly responded agreeing enter requested boys should permitted fly Later day Hal asked serve Stunt event judge did offered constructive criticism flier became interested Old-Timer Stunt flying usual sentimental reasons several years ago Looking around OTS design build recalled having owned Stuntwagon 30 back Continued page 187 0 TOWER HOBBIEU has Mighty Lit worlds first premium grade lIght ptywood Bonds easily CA time right. use Mighty LIte TOWERSrOwERS Special StockSuggestedSPECIAL NumberRetailPRICE HEO 100 1/8x6x121560/6pcs 1299lEpcs HEOllO 1/8x12x244950/6pcs 349916pcs HEO12O 1 /8xl 2x48 4650/3pcs 329g/3pcs Call toll free 1-800-637-6050 Refer ad 01066 May1990 185 Ditectftom PATTERN TEE 320-ET uie Cteek Ct San Jo Ca 95125 Te14Ci298-Q3II Ft4Q829i-53S 1950s also Dmeco Sportwing moat Americans Building large Stuntwagon appealed time around dered set plans Fran Ptaszkiewicz began construction powered updated Stuntwagon Su perTigre 46 incorporated wing tip weight compartment adjustable lead-out guide trimming As OTS rules prohibit drop-off landing gear t added sheet aluminum gear Wagon presumably deBolt used later versions Modern glues hardware made better job could have managed back also used muffler pretty much unknown former days airplane finished off butyrate dope Im enjoying refly ing good old days working Stuntwagon thinking about vintage days Control Line Stunt par ticularly deBolt aircraft carried corres pondence Hal now living Florida re lated some history Dmeco Control Line projects Fran Ptaszkiewicz added information few nice letters Putting article together interesting fun help Mike Keville PAMPA newsletter editor OTS enthusiast able round up photos deBolt CL aircraft modelers across country After Hal Dmeco him shifted Control Line Radio Control activity came equally renowned top designer competitor arena Though better remem bered today achievements RC Hal will never lose standing influen tial designers competitors halcyon days Control Line modeling classic CL designs will flying long time come FlyWorm/de Vries Continued page 75 along inner tube walls ejected opening rear end outer spiral propulsion fins keep airstream whirling around outer tube surface sist propelling craft superpropul sion combination spiraling air cur rents both outside tubular wing angle tube placed line flight sustain craft atr COST elimination parts smaller size combination propul sion lift power principles unit structurally adapting itself mass pro duction should bring sales price aircraft within reach great majority people question mod ern factory equipment quantity produc tion price should compare cheapest automobile today Wouldnt have wonderful actually worked author wishes thank Jack Bol Denver CO sharing discovery FlyWorm certainly invention worth uncovering FF Duration/Linstrum Continued page 77 three grams perhaps fuselage must gram sturdier sustain torque whole drive system mere four grams Compare Telco full tank 15 grams MRC Electric 30 grams obvious model lifting heavy power source will climb less thus have less duration heavier motor less efficient ob taining time aloft will get weight effi ciency system dividing total thrust im pulse weight drive unit comes surprise rubber small models still king twice efficiency electricand mercymy favored CO2 drive limps behind last place beauty rubber motors lies fact torque weight duration can modified will suit individual application feel model should climb faster add few strands dont want increase weight shorten loops Infinite possiblilites exist within wide limits Efficiency 87% Electric efficiency 40% goes up Sanyo cells lighter regular Ni Cds Models limited size make mo tor CO2 efficiency 30% Telco compar atively smallthe thrust developed hardly enough keep 25-gram model level flight thrust up notch model will climb dead air flights including glide about minute picture changes rapidly larger CO2 motors brown MJ-70 displaces 70cc will keep 52-gram model aloft three minutes dead air Brown t40 twin two tanks beats rubber performance largest mo tor will run 6-in prop specified AMA rules Czech Modela Cox 020 CO2 Da vis conversion require much larger props can used AMA competition have slightly edited Fritzs remarks HANGAR-7 RIG & C/L MODELS Proffesional Neans Quality Results Cazaorsp1et IKvit PreCut AAA Raisa & Ply PrePonred Landing Gear Spruce & Maple Wood PuliSize Roiled Plans tsstructmons Wheels Controls Etc Inciuded 13 Plin~s Pls-a Kvit shove except 5CUI parts handy temptate sheet provided C PThnas Os-sly Fulisize rolled pians tesplate sheet instructions shipped rirot class sail Free Catalog $59 C $11 Rid CORSAIR 25 Distinctive Gull Wing Pavoritet SemiScale Wing Spant 4k Wing Arear 410 sq Sn Lengtht 341/2 LoadnE 5 Sq Pt Weigh 31/211 Onginet 25 o Sad 4Chasoe S A 7 C $7 tR/C HORNET 574 Spoda Wing Spant 27 WanSq25 Lnadingt il Sz/Sqna ueefl gee $ 13 $9 N/C r Wing Spon iI Wins areat 375 Sq In. Length 351/2 Weightt $39 13 $25 C $9 C/LI DROPIADER 4G nugnip Proflie Fuselage i guiltI Spant 55i/i Areat 540 Sq In. Enginet 40 $24 13 $15 C $7 39 13 S25 C 9 aprenaive Sight Profile Fuselage & RuiltIp Sheeted Wing Wing Spant 52 Areat 435 Sq Sn Enginet 35 Stunt ai~Y C/LI5 Lov Prof ile Fuselage & Soiid Raisa 05055 osog 293/5 Area 305 Sq Engine iS Cu C/LI tilfIE 5255 iS $ 2 2 Sport Piper/Tramoeoi guiltUp Sheeted Wings & Fuseloge Wiog Spant $ reat 200 Sq $7 Dealer Inquiries Invited ORDER YOURS TODAY Please add $4 shipping & handling Send check ar tooney order VISA & MC accepted Ojur street address kits pisese credit cards W STANGEL ENTERPRISES PO BOX 336 Pit t4i4 5484172 WAUKESHA WISCONSiN S31g70338 MEMBER EAA AMA May1990 187 Ideal 4-ycle F3A & AMA fl1ng Basic Ki Pre-tab -Beetle TMSuperStar 6 Basic -built Kit 1S2951 NEW Narukes Silent st 2 4-cycle